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- """For neatly implementing static typing in pip.
-
- `mypy` - the static type analysis tool we use - uses the `typing` module, which
- provides core functionality fundamental to mypy's functioning.
-
- Generally, `typing` would be imported at runtime and used in that fashion -
- it acts as a no-op at runtime and does not have any run-time overhead by
- design.
-
- As it turns out, `typing` is not vendorable - it uses separate sources for
- Python 2/Python 3. Thus, this codebase can not expect it to be present.
- To work around this, mypy allows the typing import to be behind a False-y
- optional to prevent it from running at runtime and type-comments can be used
- to remove the need for the types to be accessible directly during runtime.
-
- This module provides the False-y guard in a nicely named fashion so that a
- curious maintainer can reach here to read this.
-
- In pip, all static-typing related imports should be guarded as follows:
-
- from pip.utils.typing import MYPY_CHECK_RUNNING
-
- if MYPY_CHECK_RUNNING:
- from typing import ...
-
- Ref: https://github.com/python/mypy/issues/3216
- """
-
- MYPY_CHECK_RUNNING = False
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